Employee Benefit Plans - Additional Information (Detail) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2022	Mar. 31, 2021
Defined Benefit Plan Disclosure [Line Items]
Amortization of prior service cost		$ (19)	$ (19)
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss)		143	228
Defined Benefit Plan Amounts Recognized Gain (Loss)		124	209
Recognized from accumulated other comprehensive loss	[1]	24	85
Recognized from regulatory asset		100	124
Defined Benefit Plan Actuarial Gain Loss, Net Settlement			209
Florida Public Utilities Company Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Expected Future Employer Contributions, Remainder of Fiscal Year		300
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss)		124	155
Defined Benefit Plan Amounts Recognized Gain (Loss)		124	155
Recognized from accumulated other comprehensive loss	[1]	24	29
Recognized from regulatory asset		100	126
Chesapeake Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss)		0	60
Defined Benefit Plan Amounts Recognized Gain (Loss)		0	60
Recognized from accumulated other comprehensive loss	[1]	0	60
Chesapeake Pension SERP [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Expected Future Employer Contributions, Remainder of Fiscal Year		200
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss)		7	7
Defined Benefit Plan Amounts Recognized Gain (Loss)		7	7
Recognized from accumulated other comprehensive loss	[1]	7	7
Defined Benefit Plan Actuarial Gain Loss, Net Settlement			7
Chesapeake Postretirement Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Contribution to pension plan		100
Defined Benefit Plan, Expected Future Employer Contributions, Remainder of Fiscal Year		100
Amortization of prior service cost		(19)	(19)
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss)		12	8
Defined Benefit Plan Amounts Recognized Gain (Loss)		(7)	(11)
Recognized from accumulated other comprehensive loss	[1]	(7)	(11)
Florida Public Utilities Company Medical Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Expected Future Employer Contributions, Remainder of Fiscal Year		$ 100
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss)			(2)
Defined Benefit Plan Amounts Recognized Gain (Loss)			(2)
Recognized from regulatory asset			$ (2)

[1] See Note 9, Stockholders' Equity.